The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the incident wavelength is changed to a new value, the stopping potential is 1.43V. The new wavelength is

<p>Stopping potential defined in terms of wavelength as :</p><p><math><mrow><mi>e</mi><mi>V</mi><mo>=</mo><mfrac><mrow><mi>h</mi><mi>c</mi></mrow><mrow><mi>λ</mi></mrow></mfrac><mo>−</mo><mi>? </mi><mo>⇒</mo><mn>0</mn><mo>.</mo><mn>7</mn><mn>1</mn><mn>0</mn><mi>e</mi><mi>V</mi><mo>=</mo><mfrac><mrow><mi>h</mi><mi>c</mi></mrow><mrow><mn>4</mn><mn>9</mn><mn>1</mn></mrow></mfrac><mo>−</mo><mi>? </mi><mo>⇒</mo><mn>1</mn><mo>.</mo><mn>4</mn><mn>3</mn><mi>e</mi><mi>V</mi><mo>=</mo><mfrac><mrow><mi>h</mi><mi>c</mi></mrow><mrow><mi>λ</mi></mrow></mfrac><mo>−</mo><mi>? </mi></mrow></math></p><p>Using above two equation we can calculate :</p><p><math><mrow><mi>λ</mi><mo>=</mo><mn>3</mn><mn>8</mn><mn>2</mn><mi>n</mi><mi>m</mi></mrow></math></p>

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